Electrical relay.



C. R. H. BUHL.

ELECTRICAL RELAY.

APPLICATION FILED MAY 4. 19m.

1,177,988. I Patented Apr. 4, 1916.

T I g 577/ ffl/YZ EHBUHL- duce dual effects, particularly' in-signaling' emr. n. Bum., or cLEvELAND; omo;

ELECTRICAL RELAY.

To a-ZZ-w'llwlm z't may concern Be it known that I, CARL R. H. BUHL, a

fcitizenv ofthe `United States, residing at Cleveland, in the county of Cuyahoga, and

A State lof Ohio, have invented certain new and useful improvements in Electrical Reilays, of which the following is a specificay .My invention relates to improvements in electricall relays, andthe improvement comprisesal relay which is susceptible to a re versal of How of an electric current to prosystems for railways substantiallyas hereinafter shown and described and Inore particularly pointed out in the claims.

The general object of my invention will `be understood'by a description of one of its applications, to wit: in producing different signals in a block signaling system for railways. Thus, with my improvement difv ferent usignals vmay be automatically produced in one train at different points along the track to variously indicate danger ahead according to its proximity. Specifically, a green light may be`illu1ninated in the cab of an engine when a train is say two miles in advance thereof, thereby giving a cautionary signal of danger ahead, and a red light may also be illuminated by the same devices when the engine approaches nearer Y, to the danger zone, say one mile nearer. In

this system, my device combines with other electrical devices having electrical connecnections with the rails to bring about a reversal'of current by the travel of the train on the tracks; by a break in the lelectrical circuits, or by any open switch. l. ,Y

In the accompanying drawing, Figure l is a front view of my improved relay, and Figs. 2 and 3 are sectional views thereof `on lines X--X and Y-Y respectively, of

F ig. 1.

The relay comprises .a peculiarly constructed electro-magnet having a soft iron core 25 of the usual horse-shoe form with coils 26 and 27 wound upon the same to give the ends of the horse-shoe opposite polarities. These coils are connected in series in a suitable electric circuit in which a reversal of current occurs, and'therefore when a reversal of current occurs over said circuit a corresponding reversal is had in the coils. The polarity of the core ends may thus be reversed, and in order to avail myself of this result to operate an armature 30 which Specication of Letters Patent.

the coreends.

' .'Patented Alpha-191e.

v Application led May 4, 1910. `Serial o. 558,387.

is pivotally mounted opposite the ends of the core with its fulcrum or pivot 31- intermediate said ends, I fasten a permanent magnet 32 of bar shape to the cross piece 33 of the core and extend it to a point opposite Armature 30 is mounted on this. end of permanentv magnet bar 32' and manifestly this end and the vmagnet-bar have the same polarity as one of the core ends. Now as poles of like polarity repelv each other, larmature 30 will be constantly repelled at one or the other of the poles off the electro-magnet when the current is liowing, dependent upon the direction of the current .through the coils, and it also olf lows that the unlike poles willbelattracted accordingly. Briefly, the object is to make varmature 30 a permanentfsouth pole and by reversing the flow of the current, change the poles 25 of the magnet as occasion requires so that the resultant north pole` will tilt the armature on its pivots either tov one side or the other and therethrough cause a flow of the current through either one of two given signal lights or other electrical devices. To this end, the lights or devices are-connected by wires leading to contacts 37. and 38 which are adapted to.be A

engaged by the armature in its tilting movements, and whereby the current may bel caused to flow through either contact mentioned, but not both. Springs 39 normally hold armature 30` out of en 'agement with both contacts 37 and 38, an wires 40 and 41 lead from said springs or from armature 30 to the brush and the third rail'side of the circuit. v f The core ends 42 are bent or curvedto one side, and armature 30 is mounted oppositely thereto and has i'at4 spring ends .39 which are engaged by screws 43 to varyand' adjust the tension or balance of the armature. Contacts 37 and '38 are also'screws, preferably platinum tipped. 'The permanent magnet. bar 32 is slotted at its right angled end and a screw 29 adjustably secures ,said bar to yoke 33 at said slot to permit armature 30 to .be bodily shifted laterally in respect to the core ends 42. WhatIclaimis: v -fyt 1. A relay comprising a. soft iron core of bar shape secured to said cores and extending to a4 point opposite the core ends,

an armature pivotally mounted on said bar magnet, sprlngs on sald armature, tenslonv screws engaged by said springs, and separate contacts mounted opposite the ends'of said armature `and adapted to be engaged thereby.

coil Wound upon the same,

l2. A relay comprising a core and a double on said bar opposite the end of the core, cont'aets for said armature,l and springs to hold said armature normally out of engagement with said contacts. l A

In testimony whereof I aix my signature :in presence of two Witnesses.

CARL R. H. B UHL.

' Wtnessesz Y E. M. FISHER, R. B. MOSER. 

